I'm currently trying to solve my issues with adding network printers over Samba in Sabayon and just wanted a place to put what I've found so far. Sure you can add a printer manually in cups using the ip address of the printer, but who wants to do that? I use the gnome 3 and lxde wms depending on how I feel on a certain day. Gnome comes with a printer application under system settings. When you try to add a printer over the network with Samba, you are greeted with this fun little message:

A little research and I found out that firewalld is a fedora program and lots of other people are having the same problem. Basically it sounds like something gnome needs to fix. Moving on I tried system-config-printer-gnome which is in the repo. This time, the button was greyed out with the message "Browsing not available (pysmbc not installed)". Fun.

I currently have a bug report open for this issue at https://bugs.sabayon.org/show_bug.cgi?id=3229 . Hopefully once pysmbc is added I can finally add my network printers without wanting to stab things! I'll post an update once it's done.